closed at this point. While the hose is still con-
nected to the upper charge valve and the water
is running, open the lower purge/drain valve
(COMPONENT #11, FIGURES 15A; 15B;
16A; 16B; 17A; 17B ) and let the water run out
until it is free of impurities or debris that might
have entered the piping as the components were
plumbed. Water soluble flux should be used
when soldering pipe joints in the collector loop
in order to facilitate system flushing. Run the
water long enough to eliminate any air bubbles
that may be trapped in the system.
Install the solar expansion tank and confirm
that the precharge pressure is 3-5psig less than
the desired system pressure. The non-potable
expansion tank should not be connected to the
collector loop during flushing to prevent debris
from lodging inside the expansion tank cham-
ber.
Close the lower purge/drain valve. The collec-
tor loop now has been subjected to city pres-
sure. The PRV should not discharge provided
it is set to a higher pressure than of the typical
mains pressure at the location. Close the fill
valve and allow the pressure in the loop to sta-
bilize, if the city water pressure is higher than
the PRV open the purge valve slightly to allow
the loop pressure to drop to about 60 PSI. Once
stabilized, the collector loop pressure should
remain fairly constant. A continuous drop in
P.19
1
10
15
16
5
17
18
20
21
22
32
23
FEED
RETURN
HOT SUPPLY LINE
TO FIXTURES
COLD SUPPLY
LINE
3
PIPE INSULATION
ROOF JACKS
1. SunEarth Solar Collector
(s)
2. Collector Sensor
3.
Option Tank and Line
Thermometers
4.
Check Valve
5.
Isolation Ball Valve
6.
Pressure Relief Valve
7. Pressure Gauge
8.
Expansion Tank
10.
Isolation Ball Valve
15.
Flush Valve
16.
Tank Sensor
17.
Cold Water Dip Tube
18.
Differential Temperature
Controller
19. Heat Exchanger
20.
Anode Rod
21.
Heating Element & Tank
Thermostat
22.
Temperature and Pres-
sure Relief Valve
23.
Cold Water Supply Line
Isolation Ball Valve
32.
Mixing Valve
33.
Optional Time Switch
34.
SunEarth SolarStation
8
3, 10
11, 12
3, 4
9
13
6
7
2
T2
T1
SINGLE TANK W/SOLAR STATION
SYSTEM SCHEMATIC
fig. 15b
